ALL immortals ONLY ONE of TWO options

Magical Attack, Epic (Gold) immortals:

Merlin, Empress Wu, Cleopatra, Hammurabi, Baldwin IV, Medb, Himiko, Theodora

The REST of the Epic/Gold immortals not listed below are PHYSICAL ATTACK.

That is truly as simple as that, and just knowing that, can save you a LOT of wasted time AND resources (AND money). DO NOT PUT ANYTHING INTO MAGICAL DAMAGE or use any skills for boosting anything MAGICAL, if the immortal is PHYSICAL DAMAGE. DOING SO WILL NOT HELP YOU IN ANY WAY, AND IS A COMPLETE WASTE. [And obviously that works in the reverse way.]